D&D General Why do people like Alignment?

[EzekielRaiden]

I'm pretty sure the answer you're going to hear will be something like: "Well, nobody is forcing them to play".

I am quite used to GM-centric arguments, where a behavior is morally unacceptable from players, but GMs doing it is not only right and proper, it's expected or even required. Doesn't make such arguments not incredibly tedious, mind, but I expect them.